论文标题
NGC 5585中的超X射线源气泡
The ultraluminous X-ray source bubble in NGC 5585
论文作者
论文摘要
某些超X射线源（ULX）被碰撞电离气泡所包围，比超新星残留物更大，更富含活力：它们是与超级 - 埃德丁顿X射线源相关的强大外流的证据。我们说明了该课程的最新成员：NGC 5585中的ULX周围的巨大（350 pc x 220 pc）泡泡。我们建模了ULX的X射线属性（具有Chandra和Xmm-Newton的X射线源（具有L_X〜2-4 x 10^{39} ERG/s）的X射线源，并可能对其进行了选择。我们使用大型双眼望远镜研究了来自电离气泡的光发射。我们表明，线发射光谱指示碰撞电离。我们完善了从光学线宽度推断电击速度的方法。我们得出平均冲击速度〜125 km/s，气泡的动态年龄〜600,000年，平均机械功率P_W〜10^{40} eRG/s;因此，机械功率比当前的光子光度高几倍。有了非常大的阵列观测，我们发现并解决了与光气泡相同大小的强大无线电气泡，在亮度范围的上端，对于这种类型的来源，在亮度范围内的1.4-GHz光度〜10^{35} erg/s。我们解释了为什么随着无线电超新星残留物趋于消退，随着ULX气泡的扩展，它们会变得更加发光。
Some ultraluminous X-ray sources (ULXs) are surrounded by collisionally ionized bubbles, larger and more energetic than supernova remnants: they are evidence of the powerful outflows associated with super-Eddington X-ray sources. We illustrate the most recent addition to this class: a huge (350 pc x 220 pc in diameter) bubble around a ULX in NGC 5585. We modelled the X-ray properties of the ULX (a broadened-disc source with L_X ~ 2-4 x 10^{39} erg/s) from Chandra and XMM-Newton, and identified its likely optical counterpart in Hubble Space Telescope images. We used the Large Binocular Telescope to study the optical emission from the ionized bubble. We show that the line emission spectrum is indicative of collisional ionization. We refine the method for inferring the shock velocity from the width of the optical lines. We derive an average shock velocity ~125 km/s, which corresponds to a dynamical age of ~600,000 years for the bubble, and an average mechanical power P_w ~ 10^{40} erg/s; thus, the mechanical power is a few times higher than the current photon luminosity. With Very Large Array observations, we discovered and resolved a powerful radio bubble with the same size as the optical bubble, and a 1.4-GHz luminosity ~10^{35} erg/s, at the upper end of the luminosity range for this type of source. We explain why ULX bubbles tend to become more radio luminous as they expand while radio supernova remnants tend to fade.
